using System;
using System.Collections.Generic;

namespace GenericMethodAppl
{
  class Program
  {
    static void Swap<T>(ref T lhs, ref T rhs)
    {
      T temp;
      temp = lhs;
      lhs = rhs;
      rhs = temp;
    }
    static void Main(string[] args)
    {
      int a, b;
      char c, d;
      a = 10;
      b = 20;
      c = 'I';
      d = 'V';

      // 在交换之前显示值
      Console.WriteLine("Int values before calling swap:");
      Console.WriteLine("a = {0}, b = {1}", a, b);
      Console.WriteLine("Char values before calling swap:");
      Console.WriteLine("c = {0}, d = {1}", c, d);

      // 调用 swap
      Swap<int>(ref a, ref b);
      Swap<char>(ref c, ref d);

      // 在交换之后显示值
      Console.WriteLine("Int values after calling swap:");
      Console.WriteLine("a = {0}, b = {1}", a, b);
      Console.WriteLine("Char values after calling swap:");
      Console.WriteLine("c = {0}, d = {1}", c, d);
      Console.ReadKey();
    }
  }
}